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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I think that StringBuffer is used when you work in a thread, but in this case with StringBuilder is enough
Why StringBuffer instead of StringBuilder?
StringBuilder in this case is probably more performative, right?!
What the.. clever code I saw repeat method for the first time. Thank you